For testing, inspection or critical production processes. Hand & stationary pressure testers are protected with a stainless steel, liquid filled diaphragm. Then recalibrated on a high accuracy dead weight tester. A serial number and certification of accuracy are supplied. (N.I.S.T. traceble) It is also supplied with an instrument toggle valve for pre-pressurizing. This gauge combines accuracy with rugged construction, accuracy + or - 0.5% of span. Valve adaptors are available under accessories. They are available in 100psi, 160 psi, 200 psi, 300 psi. In order to decide which pressure range will meet your needs, the range being tested should be in the middle of the scale. Example: testing 100 psi, you would need the 0-200 psi gauge. When ordering see the psi in the model number. Other pressure ranges available upon request.*Comes with brass toggle valve and test report, traceable to N.I.S.T. Rugged Plano lockable gun security, foam padded carry case, Also made in USA.